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      <h1 id="SpringBoot-12-整合Druid"><a href="#SpringBoot-12-整合Druid" class="headerlink" title="SpringBoot-12-整合Druid"></a>SpringBoot-12-整合Druid</h1><h2 id="1-简介"><a href="#1-简介" class="headerlink" title="1. 简介"></a>1. 简介</h2><p>​    Java程序很大一部分要操作数据库，为了提高操作数据库时候的性能，又不得不适用数据库连接池。</p>
<p>​    Druid是阿里巴巴开源平台上的一个数据库连接池的实现，结合了C3P，DBPC等优秀DB池的特点，同时又加入了日志监控的功能。</p>
<p>​    Druid已经在阿里巴巴部署了超过600个应用，经过一年多生产环境大规模部署的严苛考验。</p>
<p>​    Spring Boot 2.0 以上默认使用 Hikari 数据源，可以说 Hikari 与 Driud 都是当前 Java Web 上最优秀的数据源，我们来重点介绍 Spring Boot 如何集成 Druid 数据源，如何实现数据库监控。</p>
<p>Github地址：<a href="https://github.com/alibaba/druid/" target="_blank" rel="noopener">https://github.com/alibaba/druid/</a></p>
<a id="more"></a>

<p><strong>基本配置参数如下：</strong></p>
<table>
<thead>
<tr>
<th>属性</th>
<th>说明</th>
<th>建议值</th>
</tr>
</thead>
<tbody><tr>
<td>url</td>
<td>数据库的jdbc连接地址。一般为连接oracle/mysql。示例如下：</td>
<td></td>
</tr>
<tr>
<td></td>
<td>mysql : jdbc:mysql://ip:port/dbname?option1&amp;option2&amp;…</td>
<td></td>
</tr>
<tr>
<td></td>
<td>oracle : jdbc:oracle:thin:@ip:port:oracle_sid</td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>username</td>
<td>登录数据库的用户名</td>
<td></td>
</tr>
<tr>
<td>password</td>
<td>登录数据库的用户密码</td>
<td></td>
</tr>
<tr>
<td>initialSize</td>
<td>启动程序时，在连接池中初始化多少个连接</td>
<td>10-50已足够</td>
</tr>
<tr>
<td>maxActive</td>
<td>连接池中最多支持多少个活动会话</td>
<td></td>
</tr>
<tr>
<td>maxWait</td>
<td>程序向连接池中请求连接时,超过maxWait的值后，认为本次请求失败，即连接池</td>
<td>100</td>
</tr>
<tr>
<td></td>
<td>没有可用连接，单位毫秒，设置-1时表示无限等待</td>
<td></td>
</tr>
<tr>
<td>minEvictableIdleTimeMillis</td>
<td>池中某个连接的空闲时长达到 N 毫秒后, 连接池在下次检查空闲连接时，将</td>
<td>见说明部分</td>
</tr>
<tr>
<td></td>
<td>回收该连接,要小于防火墙超时设置</td>
<td></td>
</tr>
<tr>
<td></td>
<td>net.netfilter.nf_conntrack_tcp_timeout_established的设置</td>
<td></td>
</tr>
<tr>
<td>timeBetweenEvictionRunsMillis</td>
<td>检查空闲连接的频率，单位毫秒, 非正整数时表示不进行检查</td>
<td></td>
</tr>
<tr>
<td>keepAlive</td>
<td>程序没有close连接且空闲时长超过 minEvictableIdleTimeMillis,则会执</td>
<td>true</td>
</tr>
<tr>
<td></td>
<td>行validationQuery指定的SQL,以保证该程序连接不会池kill掉,其范围不超</td>
<td></td>
</tr>
<tr>
<td></td>
<td>过minIdle指定的连接个数。</td>
<td></td>
</tr>
<tr>
<td>minIdle</td>
<td>回收空闲连接时，将保证至少有minIdle个连接.</td>
<td>与initialSize相同</td>
</tr>
<tr>
<td>removeAbandoned</td>
<td>要求程序从池中get到连接后, N 秒后必须close,否则druid 会强制回收该</td>
<td>false,当发现程序有未</td>
</tr>
<tr>
<td></td>
<td>连接,不管该连接中是活动还是空闲, 以防止进程不会进行close而霸占连接。</td>
<td>正常close连接时设置为true</td>
</tr>
<tr>
<td>removeAbandonedTimeout</td>
<td>设置druid 强制回收连接的时限，当程序从池中get到连接开始算起，超过此</td>
<td>应大于业务运行最长时间</td>
</tr>
<tr>
<td></td>
<td>值后，druid将强制回收该连接，单位秒。</td>
<td></td>
</tr>
<tr>
<td>logAbandoned</td>
<td>当druid强制回收连接后，是否将stack trace 记录到日志中</td>
<td>true</td>
</tr>
<tr>
<td>testWhileIdle</td>
<td>当程序请求连接，池在分配连接时，是否先检查该连接是否有效。(高效)</td>
<td>true</td>
</tr>
<tr>
<td>validationQuery</td>
<td>检查池中的连接是否仍可用的 SQL 语句,drui会连接到数据库执行该SQL, 如果</td>
<td></td>
</tr>
<tr>
<td></td>
<td>正常返回，则表示连接可用，否则表示连接不可用</td>
<td></td>
</tr>
<tr>
<td>testOnBorrow</td>
<td>程序 <strong>申请</strong> 连接时,进行连接有效性检查（低效，影响性能）</td>
<td>false</td>
</tr>
<tr>
<td>testOnReturn</td>
<td>程序 <strong>返还</strong> 连接时,进行连接有效性检查（低效，影响性能）</td>
<td>false</td>
</tr>
<tr>
<td>poolPreparedStatements</td>
<td>缓存通过以下两个方法发起的SQL:</td>
<td>true</td>
</tr>
<tr>
<td></td>
<td>public PreparedStatement prepareStatement(String sql)</td>
<td></td>
</tr>
<tr>
<td></td>
<td>public PreparedStatement prepareStatement(String sql,</td>
<td></td>
</tr>
<tr>
<td></td>
<td>int resultSetType, int resultSetConcurrency)</td>
<td></td>
</tr>
<tr>
<td>maxPoolPrepareStatementPerConnectionSize</td>
<td>每个连接最多缓存多少个SQL</td>
<td>20</td>
</tr>
<tr>
<td>filters</td>
<td>这里配置的是插件,常用的插件有:</td>
<td>stat,wall,slf4j</td>
</tr>
<tr>
<td></td>
<td>监控统计: filter:stat</td>
<td></td>
</tr>
<tr>
<td></td>
<td>日志监控: filter:log4j 或者 slf4j</td>
<td></td>
</tr>
<tr>
<td></td>
<td>防御SQL注入: filter:wall</td>
<td></td>
</tr>
<tr>
<td>connectProperties</td>
<td>连接属性。比如设置一些连接池统计方面的配置。</td>
<td></td>
</tr>
<tr>
<td></td>
<td>druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000</td>
<td></td>
</tr>
<tr>
<td></td>
<td>比如设置一些数据库连接属性:</td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
</tbody></table>
<p>在Spring或者Spring Boot中的配置可参考下面博客：</p>
<p><a href="https://www.cnblogs.com/halberd-lee/p/11304790.html" target="_blank" rel="noopener">https://www.cnblogs.com/halberd-lee/p/11304790.html</a></p>
<h2 id="2-整合Druid"><a href="#2-整合Druid" class="headerlink" title="2. 整合Druid"></a>2. 整合Druid</h2><h3 id="2-1-配置数据源"><a href="#2-1-配置数据源" class="headerlink" title="2.1 配置数据源"></a>2.1 配置数据源</h3><ol>
<li>添加上 Druid 数据源依赖。</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- https://mvnrepository.com/artifact/com.alibaba/druid --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>com.alibaba<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>druid<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.1.21<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ol start="2">
<li>切换数据源；之前已经说过 Spring Boot 2.0 以上默认使用 com.zaxxer.hikari.HikariDataSource 数据源，但可以 通过 spring.datasource.type 指定数据源。</li>
</ol>
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">datasource:</span></span><br><span class="line">    <span class="attr">username:</span> <span class="string">root</span></span><br><span class="line">    <span class="attr">password:</span> <span class="number">123456</span></span><br><span class="line">    <span class="attr">url:</span> <span class="string">jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=utf-8</span></span><br><span class="line">    <span class="attr">driver-class-name:</span> <span class="string">com.mysql.cj.jdbc.Driver</span></span><br><span class="line">    <span class="attr">type:</span> <span class="string">com.alibaba.druid.pool.DruidDataSource</span> <span class="comment"># 自定义数据源</span></span><br></pre></td></tr></table></figure>

<ol start="3">
<li>数据源切换之后，在测试类中注入 DataSource，然后获取到它，输出一看便知是否成功切换；</li>
</ol>
<p><img src="https://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200402091937.png" alt=""></p>
<ol start="4">
<li>切换成功！既然切换成功，就可以设置数据源连接初始化大小、最大连接数、等待时间、最小连接数 等设置项；可以查看源码</li>
</ol>
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">datasource:</span></span><br><span class="line">    <span class="attr">username:</span> <span class="string">root</span></span><br><span class="line">    <span class="attr">password:</span> <span class="number">123456</span></span><br><span class="line">    <span class="attr">url:</span> <span class="string">jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=utf-8</span></span><br><span class="line">    <span class="attr">driver-class-name:</span> <span class="string">com.mysql.cj.jdbc.Driver</span></span><br><span class="line">    <span class="attr">type:</span> <span class="string">com.alibaba.druid.pool.DruidDataSource</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">#Springboot 默认是不注入这些属性值的，需要自己绑定</span></span><br><span class="line">    <span class="comment">#Druid 数据源专有配置</span></span><br><span class="line">    <span class="attr">initialSize:</span> <span class="number">5</span></span><br><span class="line">    <span class="attr">minIdle:</span> <span class="number">5</span></span><br><span class="line">    <span class="attr">maxActive:</span> <span class="number">20</span></span><br><span class="line">    <span class="attr">maxWait:</span> <span class="number">60000</span></span><br><span class="line">    <span class="attr">timeBetweenEvictionRunsMillis:</span> <span class="number">60000</span></span><br><span class="line">    <span class="attr">minEvictableIdleTimeMillis:</span> <span class="number">300000</span></span><br><span class="line">    <span class="attr">validationQuery:</span> <span class="string">SELECT</span> <span class="number">1</span> <span class="string">FROM</span> <span class="string">DUAL</span></span><br><span class="line">    <span class="attr">testWhileIdle:</span> <span class="literal">true</span></span><br><span class="line">    <span class="attr">testOnBorrow:</span> <span class="literal">false</span></span><br><span class="line">    <span class="attr">testOnReturn:</span> <span class="literal">false</span></span><br><span class="line">    <span class="attr">poolPreparedStatements:</span> <span class="literal">true</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">#配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入</span></span><br><span class="line">    <span class="comment">#如果允许时报错  java.lang.ClassNotFoundException: org.apache.log4j.Priority</span></span><br><span class="line">    <span class="comment">#则导入 log4j 依赖即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j</span></span><br><span class="line">    <span class="attr">filters:</span> <span class="string">stat,wall,log4j</span></span><br><span class="line">    <span class="attr">maxPoolPreparedStatementPerConnectionSize:</span> <span class="number">20</span></span><br><span class="line">    <span class="attr">useGlobalDataSourceStat:</span> <span class="literal">true</span></span><br><span class="line">    <span class="attr">connectionProperties:</span> <span class="string">druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500</span></span><br></pre></td></tr></table></figure>

<ol start="5">
<li>导入log4j的依赖</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- https://mvnrepository.com/artifact/log4j/log4j --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>log4j<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>log4j<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.2.17<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ol start="6">
<li>现在需要做的是自己为DruidDataSource绑定全局配置文件中的参数，再添加到容器中，而不再使用Spring Boot自动生成的了，我们需要自己添加DruidDataSource组件到容器中，并绑定属性。</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DruidConfig</span> </span>&#123;</span><br><span class="line">    <span class="comment">/*</span></span><br><span class="line"><span class="comment">   将自定义的 Druid数据源添加到容器中，不再让 Spring Boot 自动创建</span></span><br><span class="line"><span class="comment">   绑定全局配置文件中的 druid 数据源属性到 com.alibaba.druid.pool.DruidDataSource从而让它们生效</span></span><br><span class="line"><span class="comment">   @ConfigurationProperties(prefix = "spring.datasource")：作用就是将 全局配置文件中</span></span><br><span class="line"><span class="comment">   前缀为 spring.datasource的属性值注入到 com.alibaba.druid.pool.DruidDataSource 的同名参数中</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line">    <span class="meta">@ConfigurationProperties</span>(prefix = <span class="string">"spring.datasource"</span>)</span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> DataSource <span class="title">druidDataSource</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> DruidDataSource();</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>

<ol start="7">
<li>去测试类中测试一下；看是否成功！</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@SpringBootTest</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">SpringbootDataJdbcApplicationTests</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//DI注入数据源</span></span><br><span class="line">    <span class="meta">@Autowired</span></span><br><span class="line">    DataSource dataSource;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">contextLoads</span><span class="params">()</span> <span class="keyword">throws</span> SQLException </span>&#123;</span><br><span class="line">        <span class="comment">//看一下默认数据源</span></span><br><span class="line">        System.out.println(dataSource.getClass());</span><br><span class="line">        <span class="comment">//获得连接</span></span><br><span class="line">        Connection connection =   dataSource.getConnection();</span><br><span class="line">        System.out.println(connection);</span><br><span class="line"></span><br><span class="line">        DruidDataSource druidDataSource = (DruidDataSource) dataSource;</span><br><span class="line">        System.out.println(<span class="string">"druidDataSource 数据源最大连接数："</span> + druidDataSource.getMaxActive());</span><br><span class="line">        System.out.println(<span class="string">"druidDataSource 数据源初始化连接数："</span> + druidDataSource.getInitialSize());</span><br><span class="line"></span><br><span class="line">        <span class="comment">//关闭连接</span></span><br><span class="line">        connection.close();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="2-2-配置数据源监控"><a href="#2-2-配置数据源监控" class="headerlink" title="2.2 配置数据源监控"></a>2.2 配置数据源监控</h3><p>Druid 数据源具有监控的功能，并提供了一个 web 界面方便用户查看，类似安装 路由器 时，人家也提供了一个默认的 web 页面。</p>
<p>所以<strong>第一步需要设置 Druid 的后台管理页面，比如 登录账号、密码 等；配置后台管理；</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//配置 Druid 监控管理后台的Servlet；</span></span><br><span class="line"><span class="comment">//内置 Servlet 容器时没有web.xml文件，所以使用 Spring Boot 的注册 Servlet 方式</span></span><br><span class="line"><span class="meta">@Bean</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> ServletRegistrationBean <span class="title">statViewServlet</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    ServletRegistrationBean bean = <span class="keyword">new</span> ServletRegistrationBean(<span class="keyword">new</span> StatViewServlet(), <span class="string">"/druid/*"</span>);</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 这些参数可以在 com.alibaba.druid.support.http.StatViewServlet </span></span><br><span class="line">    <span class="comment">// 的父类 com.alibaba.druid.support.http.ResourceServlet 中找到</span></span><br><span class="line">    Map&lt;String, String&gt; initParams = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br><span class="line">    initParams.put(<span class="string">"loginUsername"</span>, <span class="string">"admin"</span>); <span class="comment">//后台管理界面的登录账号</span></span><br><span class="line">    initParams.put(<span class="string">"loginPassword"</span>, <span class="string">"123456"</span>); <span class="comment">//后台管理界面的登录密码</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">//后台允许谁可以访问</span></span><br><span class="line">    <span class="comment">//initParams.put("allow", "localhost")：表示只有本机可以访问</span></span><br><span class="line">    <span class="comment">//initParams.put("allow", "")：为空或者为null时，表示允许所有访问</span></span><br><span class="line">    initParams.put(<span class="string">"allow"</span>, <span class="string">""</span>);</span><br><span class="line">    <span class="comment">//deny：Druid 后台拒绝谁访问</span></span><br><span class="line">    <span class="comment">//initParams.put("kuangshen", "192.168.1.20");表示禁止此ip访问</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">//设置初始化参数</span></span><br><span class="line">    bean.setInitParameters(initParams);</span><br><span class="line">    <span class="keyword">return</span> bean;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>配置完毕后，我们可以选择访问 ：<a href="http://localhost:8080/druid/login.html" target="_blank" rel="noopener">http://localhost:8080/druid/login.html</a></p>
<p><img src="https://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200402092741.png" alt=""></p>
<p><img src="https://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200402092818.png" alt=""></p>
<h3 id="2-3-配置过滤器"><a href="#2-3-配置过滤器" class="headerlink" title="2.3 配置过滤器"></a>2.3 配置过滤器</h3><p><strong>Druid web 监控 filter 过滤器:WebStatFilter</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//配置 Druid 监控 之  web 监控的 filter</span></span><br><span class="line"><span class="comment">//WebStatFilter：用于配置Web和Druid数据源之间的管理关联监控统计</span></span><br><span class="line"><span class="meta">@Bean</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> FilterRegistrationBean <span class="title">webStatFilter</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    FilterRegistrationBean bean = <span class="keyword">new</span> FilterRegistrationBean();</span><br><span class="line">    bean.setFilter(<span class="keyword">new</span> WebStatFilter());</span><br><span class="line"></span><br><span class="line">    <span class="comment">//exclusions：设置哪些请求进行过滤排除掉，从而不进行统计</span></span><br><span class="line">    Map&lt;String, String&gt; initParams = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br><span class="line">    initParams.put(<span class="string">"exclusions"</span>, <span class="string">"*.js,*.css,/druid/*,/jdbc/*"</span>);</span><br><span class="line">    bean.setInitParameters(initParams);</span><br><span class="line"></span><br><span class="line">    <span class="comment">//"/*" 表示过滤所有请求</span></span><br><span class="line">    bean.setUrlPatterns(Arrays.asList(<span class="string">"/*"</span>));</span><br><span class="line">    <span class="keyword">return</span> bean;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>


      
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                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script>



<script type="text/x-mathjax-config">
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      tex2jax: {
          inlineMath: [ ['$','$'], ["\\(","\\)"]  ],
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  MathJax.Hub.Queue(function() {
      var all = MathJax.Hub.getAllJax(), i;
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<script src="https://cdn.jsdelivr.net/npm/mathjax@2.7.6/unpacked/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>


<script type="text/javascript" src="https://js.users.51.la/20544303.js"></script>
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